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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2/w = 14/56 // - 14/56
2/w-(14/56) = 0
2/w-1/4 = 0
2*w^-1 = 1/4 // : 2
w^-1 = 1/8
-1 < 0
1/(w^1) = 1/8 // * w^1
1 = 1/8*w^1 // : 1/8
8 = w^1
w = 8
w = 8
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